---
title: "SEDOL"
description: "A SEDOL is a seven-character security identifier issued by the London Stock Exchange for UK and Irish securities; it is embedded in GB and IE ISINs."
canonical: https://fundfactsapi.com/glossary/sedol
published: 2026-09-04
updated: 2026-09-04
publisher: FundFacts API
---

# SEDOL (Stock Exchange Daily Official List number, SEDOL code)

> A SEDOL is a seven-character security identifier issued by the London Stock Exchange for UK and Irish securities; it is embedded in GB and IE ISINs.

A **SEDOL** (Stock Exchange Daily Official List number) is a seven-character identifier assigned by the London Stock Exchange to securities traded or settled in the UK and Ireland, including fund share classes. The first six characters are alphanumeric and the seventh is a check digit calculated from a weighted sum. Older SEDOLs are purely numeric; newer ones begin with a letter, and vowels are never used to avoid spelling words.

The SEDOL is the national identifier inside a GB or IE [ISIN](https://fundfactsapi.com/glossary/isin): the ISIN is the country prefix, two zeros, the SEDOL and a final ISIN check digit. `IE00B4L5Y983` therefore contains the SEDOL `B4L5Y98`.

## Why it matters

UK platforms, custodians and back-office systems often key on SEDOL rather than ISIN, and Irish-domiciled UCITS ETFs, which make up a large share of the European ETF market, carry SEDOLs because their ISINs are issued in Ireland. If your users or data feeds arrive with SEDOLs, you need to convert them before calling an ISIN-based API.

## In the API

FundFacts API is keyed on ISIN, so a SEDOL must be converted first. For GB and IE securities the conversion is mechanical: prepend the country code and `00`, then compute the ISIN check digit.

```json
{
  "isin": "IE00B4L5Y983",
  "name": "iShares Core MSCI World UCITS ETF USD (Acc)",
  "cached": true
}
```

Response header fields shown; the payload itself does not repeat the SEDOL.

## Common pitfalls

- A SEDOL identifies a security, not a listing, so it does not tell you which exchange to trade on. That is the [ticker](https://fundfactsapi.com/glossary/ticker)'s job.
- Never store SEDOLs as numbers: leading zeros and letters are significant.

## About FundFacts API

FundFacts turns any fund or ETF ISIN into one dated factsheet (fees and KID costs, the 1–7 risk indicator, holdings, sector and country exposure, returns) read from the fund house's own documents: as a client-ready PDF under your firm's name for advisers and wealth managers, as JSON through its API for developers, or inside ChatGPT and Claude through its MCP server.

FundFacts works inside ChatGPT and Claude as a connector (a remote MCP server): ask about any fund or ETF by ISIN, ticker or name and the assistant answers from FundFacts' dated figures, fees, risk, holdings, exposure and returns, with fund cards, side-by-side comparisons, holdings overlap and portfolio look-through.

- Free API key, no card: https://fundfactsapi.com/signup
- Documentation: https://fundfactsapi.com/docs (OpenAPI: https://fundfactsapi.com/openapi.json)
- MCP server: https://fundfactsapi.com/api/mcp (set-up for every client: https://fundfactsapi.com/mcp-server)
- Pricing: https://fundfactsapi.com/pricing
- Site index for AI assistants: https://fundfactsapi.com/llms.txt
- Informational data, not investment advice.